20655253 has 4 divisors (see below), whose sum is σ = 20760300. Its totient is φ = 20550208.

The previous prime is 20655241. The next prime is 20655259. The reversal of 20655253 is 35255602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11881809 + 8773444 = 3447^2 + 2962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20655253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52228 + ... + 52621.

It is an arithmetic number, because the mean of its divisors is an integer number (5190075).

Almost surely, 2^20655253 is an apocalyptic number.

It is an amenable number.

20655253 is a deficient number, since it is larger than the sum of its proper divisors (105047).

20655253 is a wasteful number, since it uses less digits than its factorization.

20655253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105046.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 20655253 is about 4544.8050563253. The cubic root of 20655253 is about 274.3743484607.

It can be divided in two parts, 2065525 and 3, that added together give a triangular number (2065528 = T₂₀₃₂).

The spelling of 20655253 in words is "twenty million, six hundred fifty-five thousand, two hundred fifty-three".